<template>
  <div>
    <el-upload
      v-if="this.type == 'url'"
      ref="upload"
      :action="uploadUrl"
      :before-upload="handleBeforeUpload"
      :on-success="handleUploadSuccess"
      :on-error="handleUploadError"
      name="file"
      :show-file-list="false"
      :headers="headers"
      style="display: none"
    />

    <div ref="editor" class="editor" :style="styles" />
  </div>
</template>

<script>
import Quill from 'quill'

import 'quill/dist/quill.core.css'

import 'quill/dist/quill.snow.css'

import 'quill/dist/quill.bubble.css'

import { getToken } from '@/utils/auth'

export default {
  name: 'Editor',

  props: {
    /* 编辑器的内容 */

    value: {
      type: String,

      default: ''
    },

    /* 高度 */

    height: {
      type: Number,

      default: null
    },

    /* 最小高度 */

    minHeight: {
      type: Number,

      default: null
    },

    /* 只读 */

    readOnly: {
      type: Boolean,

      default: false
    },

    // 上传文件大小限制(MB)

    fileSize: {
      type: Number,

      default: 5
    },

    /* 类型（base64格式、url格式） */

    type: {
      type: String,

      default: 'url'
    }
  },

  data() {
    return {
      uploadUrl: '', // 上传的图片服务器地址

      headers: {
        Authorization: 'Bearer ' + getToken()
      },

      Quill: null,

      currentValue: '',

      options: {
        theme: 'snow',

        bounds: document.body,

        debug: 'warn',

        modules: {
          // 工具栏配置

          toolbar: [
            ['bold', 'italic', 'underline', 'strike'], // 加粗 斜体 下划线 删除线

            ['blockquote', 'code-block'], // 引用  代码块

            [{ list: 'ordered' }, { list: 'bullet' }], // 有序、无序列表

            [{ indent: '-1' }, { indent: '+1' }], // 缩进

            [{ size: ['small', false, 'large', 'huge'] }], // 字体大小

            [{ header: [1, 2, 3, 4, 5, 6, false] }], // 标题

            [{ color: [] }, { background: [] }], // 字体颜色、字体背景颜色

            [{ align: [] }], // 对齐方式

            ['clean'], // 清除文本格式

            ['link', 'image', 'video'] // 链接、图片、视频
          ]
        },

        placeholder: '请输入内容',

        readOnly: this.readOnly
      }
    }
  },

  computed: {
    styles() {
      const style = {}

      if (this.minHeight) {
        style.minHeight = `${this.minHeight}px`
      }

      if (this.height) {
        style.height = `${this.height}px`
      }

      return style
    }
  },

  watch: {
    value: {
      handler(val) {
        if (val !== this.currentValue) {
          this.currentValue = val === null ? '' : val

          if (this.Quill) {
            this.Quill.pasteHTML(this.currentValue)
          }
        }
      },

      immediate: true
    }
  },

  mounted() {
    this.init()
  },

  beforeDestroy() {
    this.Quill = null
  },

  methods: {
    init() {
      const editor = this.$refs.editor

      this.Quill = new Quill(editor, this.options)

      // 如果设置了上传地址则自定义图片上传事件

      if (this.type === 'url') {
        const toolbar = this.Quill.getModule('toolbar')

        toolbar.addHandler('image', (value) => {
          this.uploadType = 'image'

          if (value) {
            this.$refs.upload.$children[0].$refs.input.click()
          } else {
            this.quill.format('image', false)
          }
        })
      }

      this.Quill.pasteHTML(this.currentValue)

      this.Quill.on('text-change', (delta, oldDelta, source) => {
        const html = this.$refs.editor.children[0].innerHTML

        const text = this.Quill.getText()

        const quill = this.Quill

        this.currentValue = html

        this.$emit('input', html)

        this.$emit('on-change', { html, text, quill })
      })

      this.Quill.on('text-change', (delta, oldDelta, source) => {
        this.$emit('on-text-change', delta, oldDelta, source)
      })

      this.Quill.on('selection-change', (range, oldRange, source) => {
        this.$emit('on-selection-change', range, oldRange, source)
      })

      this.Quill.on('editor-change', (eventName, ...args) => {
        this.$emit('on-editor-change', eventName, ...args)
      })
    },

    // 上传前校检格式和大小

    handleBeforeUpload(file) {
      // 校检文件大小

      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize

        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`)

          return false
        }
      }

      return true
    },

    handleUploadSuccess(res, file) {
      // 获取富文本组件实例

      const quill = this.Quill

      // 如果上传成功

      if (res.code === 200) {
        // 获取光标所在位置

        const length = quill.getSelection().index

        // 插入图片  res.url为服务器返回的图片地址

        quill.insertEmbed(length, 'image', res.data.url)

        // 调整光标到最后

        quill.setSelection(length + 1)
      } else {
        this.$message.error('图片插入失败')
      }
    },

    handleUploadError() {
      this.$message.error('图片插入失败')
    }
  }
}
</script>

<style>
.editor,
.ql-toolbar {
  white-space: pre-wrap !important;

  line-height: normal !important;
}

.quill-img {
  display: none;
}

.ql-snow .ql-tooltip[data-mode='link']::before {
  content: '请输入链接地址:';
}

.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
  border-right: 0px;

  content: '保存';

  padding-right: 0px;
}

.ql-snow .ql-tooltip[data-mode='video']::before {
  content: '请输入视频地址:';
}

.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
  content: '14px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='small']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='small']::before {
  content: '10px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='large']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='large']::before {
  content: '18px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='huge']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='huge']::before {
  content: '32px';
}

.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
  content: '文本';
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='1']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='1']::before {
  content: '标题1';
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='2']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='2']::before {
  content: '标题2';
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='3']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='3']::before {
  content: '标题3';
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='4']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='4']::before {
  content: '标题4';
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='5']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='5']::before {
  content: '标题5';
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='6']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='6']::before {
  content: '标题6';
}

.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
  content: '标准字体';
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value='serif']::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value='serif']::before {
  content: '衬线字体';
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value='monospace']::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value='monospace']::before {
  content: '等宽字体';
}
</style>
